Urine and fecal residue encrusted on the inside of ancient Roman chamber pots unearthed in Bulgaria has revealed the world's oldest known evidence of humans infected with the Cryptosporidium parasite, which causes acute gastrointestinal distress. In the first century, the Romans established a province called Moesia Inferior in the Balkan Peninsula, which includes the modern country of Bulgaria. Roman legions were tasked with defending the imperial border from the Goths , primarily from a fortress called Novae (near present-day Svishtov) and a town known as Marcianopolis (modern-day Devnya). While excavating at Novae and Marcianopolis in Bulgaria, archaeologists recovered four chamber pots, whose long-dried contents have revealed new information about health and disease in the Roman Empire .…